<?php

/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/8/22
 * Time: 13:38
 */
class 防止SQL注入
{

}
function clean($input)
{
    if (is_array($input))
    {
        foreach ($input as $key => $val)
        {
            $output[$key] = clean($val);
            // $output[$key] = $this->clean($val);
        }
    }
    else
    {
        $output = (string) $input;
        // if magic quotes is on then use strip slashes
        if (get_magic_quotes_gpc())
        {
            $output = stripslashes($output);
        }
        // $output = strip_tags($output);
        $output = htmlentities($output, ENT_QUOTES, 'UTF-8');
    }
// return the clean text
    return $output;
}

$text = "<script>alert(1)</script>";
$text = clean($text);
echo $text;